Gracious
Sianne is a modern phonetic elaboration of Sian, the Welsh form of Jane. It combines the traditional Welsh roots with a contemporary suffix to create a melodic, multi-syllabic name that retains its spiritual meaning.
Less common today
Sianne isn't in the latest US Top 1000. It last peaked at #6,354 in 1998.
US births per 5-year period, 1990βpresent (SSA data).